JPH067441A - Needle for infusion - Google Patents

Abstract

PURPOSE: To provide an infusion needle fixed and held under best adapting to the motion of a patient without being discharged from the applied site, especially concerning a needle for general infusion therapy. CONSTITUTION: This infusion needle consists of a metallic cannula 2 and a needle body 1 with a cylindrical receiving mouth 3 connected to it, and has a constitution that the metallic cannula 2 is formed as an inner absorbing needle with a conical tip and surrounded by a plastic cannula 4 which is connected to the receiving mouth 3 and tightly contacting with a little smaller diameter, that the needle body 1 has a fold in the transition region from the receiving mouth 3 to the plastic cannula 4, and that the metallic cannula 2 can be drawn out of the plastic cannula 4 and the needle body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infusion needle, and more particularly to an infusion needle for general infusion therapy which comprises a metal cannula and a needle receiver body having a cylindrical receptacle connected thereto for receiving an applicator. The metal cannula takes the form of a suction needle terminating in a cone and surrounded by a relatively short, intimate plastic cannula connected to the receptacle.

[0002]

In addition to oral and rectal administration of drugs, parenteral administration currently forms one of the basis of treatment. In modern medicine, intravenous fluid therapy and arterial infusion are partially replaced by three classical forms, namely subcutaneous, intramuscular, and intravenous infusion therapy, but subcutaneous and intradermal administration still remain. It is widely used in fluid therapy, especially in the treatment of pain and diabetes. These have evolved over a long period of time, in stages. Bleeding methods and drug delivery have been known for several years. The discovery of blood circulation at the beginning of the seventeenth century created the anatomical and naturopathic basis of fluid and blood transfusion. Even then, the first infusion test was initiated, first in animals and then in humans. Initially, the trial was unable to achieve any therapeutic effect or knowledge advance. The cause of the initial failure was probably primarily due to septic conditions, so the invention of the 19th century injectable syringe firstly broke the modernization of infusion and infusion therapy. However, a new chapter in blood transfusion theory began after the discovery of blood group groups early in this century. Their decisive foundations and techniques were only encouraged and developed at that time by the two World Wars and the development of domestic medicine and anesthesiology, and are still the most ineffective part. Subcutaneous infusion still plays an important role in the field of pain treatment, although therapeutic infusion has not been used as frequently as it used to in the past. This decline is due, in part, to the fact that resorption times are difficult to determine and are highly dependent on the particular patient's condition. On the other hand, today many different (agonist) drugs are infused that are incompatible when given subcutaneously. Nevertheless, subcutaneous techniques, especially subcutaneous infusion, are still particularly important for children. In the case of subcutaneous infusion, it is very important to carry out the infusion according to the law in the field, since the subcutaneous injection not only causes severe pain but also causes severe inflammation including skin necrosis. Subcutaneous injection is known to lead to concomitant edematous swelling with varying degrees of inflammation. As a result, the well-being of patients is often very adversely affected. However, these complications usually disappear in a few days without wounds. However, it rarely leads to skin necrosis, becomes erysipelas after secondary infection, and sepsis occurs when the initial state of the patient is not favorable. Even today, intradermal injection is a BCG vaccination (Bacille-Calmet).
te-Guerin; vaccination against tuberculosis). It is often used for curative treatment.

In subcutaneous injection or infusion, the drug must be administered by injection into subcutaneous adipose tissue,
On the other hand, in intradermal injection, the drug is administered directly to the skin. Most subcutaneous injections are given to the upper arm, thigh, or chest area. In contrast to other infusion methods, there is no significant difference in the application of this treatment to males, females, children or infants with subcutaneous infusion. In the case of injection, the injection needle is removed from the subcutaneous or intradermal tissue after administration of the drug, while the infusion needle remains at the site of application for a long time, up to several days. It is easily understood that this is not desirable for the patient as it impedes freedom of movement. Inevitable movement causes varying degrees of pain. CH-PS 400 463
Discloses an infusion cannula, specifically a continuous infusion cannula having a metal cannula and a needle receiver body having a cylindrical receptacle associated therewith. In this known needle, the metal cannula takes the form of a suction needle terminating conically and surrounded by a relatively close plastic cannula connected to the receptacle. This known infusion needle has a metal cannula that is injected into the surface of the skin at a small angle in subcutaneous or intradermal tissue. Even if this known infusion needle could be easily attached to the skin, it would project relatively high, and its folds would therefore rub against, for example, the patient's clothing, which would also cause patient pain. .

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention designs an infusion needle as described above which is best adapted to the patient's exercise as much as possible and which allows the infusion needle to be held fixed at the location of application of the infusion needle. And the subject is to further improve.

[0005]

The infusion needle for general infusion therapy according to the present invention to achieve the above object comprises a needle receiving body having a metal cannula and a cylindrical receiving port connected to the metal cannula, and the metal cannula is provided. Is in the form of an aspiration needle and is surrounded by a relatively short, intimate plastic cannula that has a conical tip and is connected to the receiving opening, the needle receiving body comprising the receiving opening and the plastic cannula. It is characterized in that it has a fold in the transition region between and the metal cannula can be pulled out from the surrounding plastic cannula and the needle receiving body. In the present invention, the metal cannula is exclusively needed for the actual injection. After injecting the infusion needle and attaching it to the application case,
The metal cannula, or "Braunuele"
The so-called mandrel in the case of (registered trademark of B. Braun Melsugnen AG) is removed from the surrounding plastic cannula. The flexible plastic cannula itself adapts to the associated movement of the subcutaneous tissue associated with the epidermis without substantially changing its position, thus relieving the patient of substantial pain from such movement.
The folds in the infusion needle according to the invention ensure that the receptacle of the needle receiving member extends substantially parallel to the surface of the patient's skin. The bend is characterized in that it lies in the range of 15 ° to 25 °, and the bend angle is particularly preferably 20 °.

According to another feature of the invention, the transition area between the cylindrical receptacle and the plastic cannula is conical. This ensures that the plastic cannula is not damaged when the mandrel is introduced during manufacture of the infusion needle. Furthermore, the even folds of the mandrel allow folds in the transition area between the receptacle and the plastic cannula.

According to another feature of the invention, the needle receiver body has a planar enlargement in the fold region and the enlargement has a flexible support on the side having the plastic cannula. . It is particularly convenient for this flexible support to be a strip of open cell plastics that extends along the edges of the enlarged portion. Such flexible supports are already known as so-called "gripper" needles such as are used in fully implantable cannula systems. It is particularly convenient for the metal cannula to have a receiving element with an integral retaining plate at the end remote from the needle tip. This ensures that the infusion needle is fully manipulated during injection. According to another feature of the invention, the needle receiving body has means for preventing axial rotation of the introduced metal cannula in the area of the receiving opening and / or the receiving element of the metal cannula. With this type of inhalation, this feature ensures the required tight connection between the tip of the obliquely mounted metal cannula and the needle receiver body. Other features and advantages of the invention will be understood and developed from the claims and the embodiments of the invention described below with reference to the accompanying drawings.

[0008]

1 and 2 show an infusion needle according to the present invention, which has a needle receiving body 1 having a metal cannula 2 and a cylindrical receiving port 3 connected thereto at a first portion. The metal cannula 2 takes the form of an inner suction cannula and is surrounded by a shorter plastic cannula 4. The plastic cannula 4 closely biases the metal cannula 2 and terminates conically and is connected to the receptacle 3. FIG. 3 shows a longitudinal sectional view of the infusion needle of FIG.
FIG. 3 clearly shows the design of the receptacle 3. In the infusion needle according to the invention, the metallic cannula 2 is in the form of a suction cannula surrounded by a relatively slightly shorter plastic cannula which closely biases the cannula 2 and terminates conically and is connected to the receptacle 3. Characterized by taking. The needle receiver body 1 has a structural fold in the transition area between the receptacle 3 and the plastic cannula 4. The metal cannula 2 is configured to be pulled out from the surrounding plastic cannula 4 and the needle receiver body 1. As mentioned above,
Advantageously, the folds are in the range 15 to 25 °. An angle of 20 ° is shown as the preferred embodiment. Figure 3 shows a cylindrical receptacle 3 and a plastic cannula 4
It is shown that the transition region between and has a conical shape. This can, on the one hand, facilitate the introduction of the metal cannula 2 and the plastic cannula 4 and, on the other hand, provide the metal cannula 2 with a suitable free space for the folding required for said folding.

With respect to the mounting of the infusion needle according to the present invention, the needle receiving body 1 has a planar enlarged portion 5 in the bending region.
Have. As can be seen from FIGS. 1 and 3, the enlargement 5 is flexible in the form of a strip 6 of open-cell plastic that extends along the edge of the enlargement 5 on the underside of the needle receiving body 1 having a plastic cannula 4. It has a support. The figure also shows how the metal cannula 2 has a receiving element 7 with an integral retaining plate 8 at the end remote from the cannula tip. This allows the injection of the drug into the applied metal cannula 2. Finally, for ease of operation, the needle receiving body 1 has means with the receiving element 7 of the metal cannula 2 for preventing axial rotation of the metal cannula 2 introduced in the region of the receiving opening 3. For this purpose, the needle receiving body 1 has a transverse projection 9 as in FIG. 1, and the receiving element 7 has a web 10 behind the ring in the form of a segmate. Since the metal cannula 2 is chamfered at a small angle in the region of its tip, it is essential for safe operation in order to ensure a regular and reliable penetration of the cannula 2 into the skin. After applying the infusion needle, the needle receiver body 1 brings the flexible support into contact with the surface of the patient's skin via the enlarged portion 5. After being fixed there continuously, the mandrel 2 (metal cannula 2) can be pulled out from the plastic cannula 4 and an appropriate applicator can be connected to the receiving opening 3 of the needle receiving body 1.

As can be seen from the drawing, after removing the mandrel 2 together with the receiving element 7 and the retaining plate 8, the plastic slip 6 is still fixed in place and compressed, so that the entire needle receiving body 1 is only slightly compressed. The height of the outer surface of the needle receiving body 1 substantially in the region of the receiving port 3.

[Brief description of drawings]

FIG. 1 is a side view of an infusion needle according to the present invention.

FIG. 2 is a plan view of an infusion needle according to the present invention.

3 is a longitudinal sectional view of the infusion needle according to the present invention taken along the line III-III in FIG.

[Explanation of symbols]

 1 ... Needle receiving body 2 ... Metal cannula 3 ... Receptacle 4 ... Plastic cannula 5 ... Enlarged portion 6 ... Strip 7 ... Receiving element 8 ... Holding plate 9 ... Protrusion 10 ... Web

Claims (7)

[Claims] 1. A needle receiving body having a metal cannula and a cylindrical receiving port connected thereto, said metal cannula (2) being in the form of a suction needle, and having a conical tip, said receiving port (3). Surrounded by a relatively short, intimate plastic cannula (4) connected to the needle holder body (1), the needle receiver body (1) is folded at the transition area between the receptacle (3) and the plastic cannula (4). Have,
The infusion needle for general infusion therapy, wherein the metal cannula (2) can be pulled out from the surrounding plastic cannula (4) and the needle receiving body (1). 2. The infusion needle according to claim 1, wherein the fold is in the range of 15 ° to 25 °. 3. Infusion needle according to claim 1 or 2, characterized in that the transition area between the cylindrical receptacle (3) and the plastic cannula (4) is conical. 4. The needle receiver body (1) has a planar enlargement (5) in the folding area and on the side with the plastic cannula (4) the enlargement (5).
Has a flexible support. The infusion needle according to claim 1, wherein the infusion needle has a flexible support. 5. Infusion needle according to claim 4, characterized in that the flexible support is a strip (6) of open-cell plastic extending along the edge of the enlarged part (5). 6. A metal cannula (2) according to claim 1, characterized in that it has a receiving element (7) with an integral retaining plate (8) at the end remote from the tip of its needle. One of the infusion needles. 7. The needle receiving body (1) is adapted for axial rotation of the metal cannula (2) introduced in the region of the receiving port (3) and / or the receiving element (7) of the metal cannula (2). Means to prevent (9, 1
0) The infusion needle according to claim 6, which has 0).